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Date: Sat, 20 Nov 2004 18:00:52 GMT
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To: freebsd-bugs@FreeBSD.org
From: Robert Watson <rwatson@FreeBSD.org>
Subject: Re: kern/74156: SMP crashes
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The following reply was made to PR kern/74156; it has been noted by GNATS.

From: Robert Watson <rwatson@FreeBSD.org>
To: freebsd-gnats-submit@FreeBSD.org
Cc:  
Subject: Re: kern/74156: SMP crashes
Date: Sat, 20 Nov 2004 17:58:40 +0000 (GMT)

 On Sat, 20 Nov 2004, O. Hartmann wrote:
 
 > Fatal trap 12: page fault while in kernel mode
 > cpuid = 1; apic = 00
 > fault virtual address   =   0x1c
 > fault code              =   supervisor write, page not present
 > instruction pointer     =   0x8:0xc062ac76
 > stack pointer           =   0x10:0xe4e2d7ac
 > frame pointer           =   0x10:0xe4e2d7c4
 > code segment            =   base 0x0, limit 0xfffff, type 0x1b
 >                         =   DPL 0, pres 1, def32 1, gran 1
 > processor eflags        =   interrupt enabled, resume, IOPL = 0                        =   DPL 0, pres 1, def32 1, gran 1
 > processor eflags        =   interrupt enabled, resume, IOPL = 0
 > current process         =   44 (swi5: clock sio)
 > [thread 100042]
 > Stopped at                  ref +0x16: lock cmpxchgl %edx, 0x1c(%edx)
 
 Could I get you to run the following commands in DDB and include the
 output here:
 
 - show pcpu
 - "show pcpu X" foreach each cpu X
 - trace
 - trace on each thread active on a cpu shown using "show pcpu"
 - Use addr2line or gdb on a kernel with debug symbols to convert the
   symbol+offsets
 
 I've seen some similar reports of a page fault out of the clock/sio
 thread, but it may well be a specific callout.
 
 Thanks!
 
 Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
 robert@fledge.watson.org      Principal Research Scientist, McAfee Research